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To the Editor: Alarm about the dangers of computed tomography (CT) scans1,2 is unjustified. The only hard facts about bio-harm from ionising radiation come from the 1945 atomic bomb explosions, which emitted very large amounts of radiation. Bio-harm from low-dose medical radiation has never been confirmed; the claim is based on backward extrapolation of data on radiation doses from the Japanese atomic bombs, which were orders of magnitude greater than doses in diagnostic radiation.

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